JP2000062442A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a front seat heating ability by utilizing the entire air flow route of a heating heat exchanger when it is necessary to increase the ability of heating the front seat in a vehicle air conditioner having a function of independently controlling the temperatures of air blown out to the front and rear seats. SOLUTION: In the air exit side of a heating heat exchanger 13, a switching door 35 for partitioning an air flow route into a front seat flow route 18 and a rear seat flow route 9 is disposed. Normally, the switching door 35 is operated to the partitioning position of the front and rear seat flow routes 8 and 9. On the other hand, when it is necessary to increase the ability of heating the front seat, the switching door 35 is operated to a position where the entire air flow route of the heating heat exchanger 13 becomes a route for the front seat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a vehicle air conditioner capable of independently controlling the temperature of air blown to the front seat side and the temperature of air blown to the rear seat side.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner capable of independently controlling the temperature of blown air to the front seat side and the rear seat side in a vehicle compartment,
As a heat exchanger for heating, one heat exchanger common to the front seat side and the rear seat side is provided in the air conditioning case, and hot air passing through the heat exchanger for heating and cold air bypassing the heat exchanger for heating are provided. The front and rear seat air mix doors that adjust the air flow rate are independently installed.

Then, on the air outlet side of the heating heat exchanger,
It is known to arrange a partition wall that divides an air flow path of a heating heat exchanger into a front seat flow path and a rear seat flow path.

[0004]

However, in the above-mentioned prior art, since the partition wall for partitioning the front seat flow passage and the rear seat flow passage is a fixed wall that is positionally immovable with respect to the air conditioning case, The air flow path of the heat exchanger for a vehicle is always partitioned into a front seat flow path and a rear seat flow path. As a result, even if you want to remove the fogging of the window glass with the maximum heating capacity in a short time as in the defroster mode, the portion of the flow path for the rear seat of the heating heat exchanger is for heating the defroster blown air. Cannot be used for. Therefore, the defroster capacity cannot be improved by using the entire heating heat exchanger, which is practically inconvenient.

Even when the passenger is not on the rear seat side and it is not necessary to blow warm air to the rear seat side (rear seat side shut state), the flow path for the rear seat of the heat exchanger for heating is changed. The part cannot be used for heating the air blown from the front seat side, which is disadvantageous for improving the heating capacity of the front seat side. The present invention has been made in view of the above points, and divides the air flow path of the heating heat exchanger into a front seat flow path and a rear seat flow path, and blown air temperature to the front seat side and the rear seat side. When it is necessary to increase the heating capacity on the front seat side in a vehicle air conditioner with a function that can independently control the heating capacity, the entire air flow path of the heat exchanger for heating is used to improve the heating capacity on the front seat side. The purpose is to be able to.

[0006]

In order to achieve the above object, in the invention according to claims 1 to 5, the air of the heating heat exchanger (13) is provided on the air outlet side of the heating heat exchanger (13). A switching door (35) for partitioning the flow path into a front seat flow path (18) and a rear seat flow path (19) is arranged, and the switching door (35) is normally used for the front seat flow path (18). And the rear seat flow path (19), and when it is necessary to increase the heating capacity to the front seat side, the switching door (35) is connected to the air in the heating heat exchanger (13). It is characterized in that the entire flow path is operated to a position where it becomes the front seat flow path.

According to this, since the partition wall of the air flow path of the heating heat exchanger (13) is not a fixed wall as in the prior art but a movable switching door (35), normally, The air passage of the heating heat exchanger (13) can be partitioned into the front seat passage (18) and the rear seat passage (19) by the switching door (35). Therefore, the air volume ratio between the warm air heated in the front seat flow path (18) of the heating heat exchanger (13) and the cool air from the front seat cold air bypass passage (15) is determined by the front seat air mix door. By adjusting by (16), the temperature of the air blown out from the front seat blowout openings (25, 29, 30) can be adjusted independently.

Further, the air volume ratio of the warm air heated in the rear seat flow path (19) of the heating heat exchanger (13) to the cool air from the rear seat cold air bypass passage (32) is determined for the rear seat. Adjusted by the air mix door (38), the blow-out opening for the rear seats (4
The temperature of the air blown from (3, 44) can be adjusted independently. Therefore, it is possible to independently control the temperature of the blown air before and after the passenger compartment.

In addition, when it is necessary to enhance the heating capacity for the front seat side (for example, in the defroster mode), the switching door (35) is provided so that the entire air flow path of the heating heat exchanger (13) is for the front seat. Since the air conditioner is operated to the position that serves as the flow path, it is possible to heat the air blown to the front seat side by utilizing the full heating capacity of the heating heat exchanger (13). Therefore, even in a vehicle having an independent temperature control function for the front and rear of the passenger compartment, the heating capacity for the front seat side can be effectively increased as necessary.

According to the second aspect of the present invention, when the switching door (35) is operated to a position where the entire air flow path of the heating heat exchanger (13) becomes the front seat flow path, the rear seat It is characterized in that the air mix door (38) is operated to the fully closed position of the rear seat cold air bypass passageway (32). According to this, when it is necessary to enhance the heating capacity to the front seat side, by fully closing the rear seat cold air bypass passage 32, it is possible to prevent the cool air from being blown to the rear seat side and to the rear seat side. Of the blower (3) can be utilized to improve the front side heating capacity.

According to the third aspect of the invention, as the front seat blowing opening, a defroster blowing opening (25) for blowing air toward the inner surface of the vehicle window glass is provided. Defroster outlet opening (25)
When the defroster mode in which air is blown toward the inner surface of the vehicle window glass from is selected, the switching door (35) is operated to a position where the entire air flow path of the heating heat exchanger (13) becomes the front seat flow path. It is characterized by that.

According to this, in the defroster mode, the front seat side heating capacity can be effectively increased and the defroster capacity can be improved. Therefore, even if the window glass of the vehicle is fogged, the fog of the window glass can be removed in a short time. This is possible, which is extremely advantageous for ensuring safety in driving the vehicle. Further, in the invention according to claim 4, when it is not necessary to blow air from the rear seat blowing openings (43, 44), the switching door (35) is set to the air flow path of the heating heat exchanger (13). It is characterized in that it is operated to a position where the whole becomes the flow path for the front seat.

According to this, the heating capacity on the front seat side can be effectively enhanced when the passenger is not on the rear seat side. In the invention according to claim 5, the defroster mode signal means (61) for outputting a signal indicating that the defroster mode is selected as the blowing mode on the front seat side.
And a rear seat side shut signal means (65) which outputs a signal indicating that air does not need to be blown out from the rear seat blowing openings (43, 44), and a drive means (72) for driving the switching door (35). ) And control means (50) to which signals from the defroster mode signal means (61) and the rear seat side shut signal means (65) are input, and in the defroster mode and at the rear seat blowing opening (43, When it is not necessary to blow air from the control unit (50), the switching door (35) is driven by the control unit (50) through the drive unit (72) so that the entire air flow path of the heating heat exchanger (13) is the front seat flow. The feature is that it is operated to a position that becomes a road.

According to this, like the inventions according to claims 3 and 4, in the defroster mode and when there is no need to blow air to the rear seat side, the front seat side heating capacity is automatically enhanced effectively. be able to. In the above-mentioned claim 5, the defroster mode signal means can be specifically constituted by a blowing mode setting device (61) operated by an occupant, and the rear seat side shut signal means is operated by an occupant. The rear seat side blowoff shut switch (65) can be used.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows the entire structure of a ventilation system of a vehicle air conditioner according to the first embodiment.
It is roughly divided into two parts, a blower unit 1 and an air conditioning unit 10. The blower unit 1 is arranged offset from the central part to the passenger seat side in the lower part of the instrument panel in the vehicle compartment.
Is arranged in the lower part of the instrument panel in the vehicle compartment at a substantially central portion in the vehicle left-right direction.

As is well known, the blower unit 1 is composed of an inside / outside air switching box 2 and a blower 3 for sucking and blowing air through the inside / outside air switching box 2. Inside / outside air switching box 2
An outside air introduction port 4 for introducing outside air (air outside the vehicle interior) and an inside air introduction port 5 for introducing inside air (air inside the vehicle interior) are formed therein. Both inlets 4 and 5 are opened and closed by an inside / outside air switching door 6. The blower 3 includes a centrifugal fan 7, a drive motor 8 and a scroll case 9.

The air-conditioning unit 10 is specifically constructed as shown in FIG. 2, and has an evaporator (cooling heat exchanger) 12 and a heater core (heating heat exchanger) in one common air-conditioning case 11. ) 13 are both integrated. The air conditioning case 11 is made of polypropylene,
It is made of a resin molded product having a certain degree of elasticity and excellent strength.

The air-conditioning case 11 is specifically composed of a plurality of divided cases. The plurality of divided cases accommodate the heat exchangers 12 and 13 and devices such as doors described later, and then metal spring clips, screws and the like. The air conditioning unit 10 is configured by being integrally connected by the fastening means. The air conditioning unit 10 part is arranged in a substantially central portion of the lower part of the instrument panel in the vehicle compartment in the form shown in FIG. An air inlet 14 is formed on the side surface of the air-conditioning case 11 that is closest to the front of the vehicle. This air inlet 1
4 includes a scroll case 9 of the blower unit 1 described above.
Blow-in air from.

An evaporator 12 is arranged in the air conditioning case 11 immediately after the air inlet 14. This evaporator 1
2 is a thin type in the vehicle front-rear direction and is vertically arranged so as to cross the passage in the air-conditioning case 11. Therefore, the blown air from the air inlet 14 flows into the front surface of the evaporator 12 extending in the vehicle vertical direction. As is well known, the evaporator 12 absorbs latent heat of vaporization of the refrigerant of the refrigeration cycle from the conditioned air to cool the conditioned air.

A heater core 13 is arranged downstream of the evaporator 12 on the air flow side (on the rear side of the vehicle) at a predetermined interval. The heater core 13 is arranged on the lower side in the air conditioning case 11 so as to be inclined toward the vehicle rear side. Although not shown, the width dimension of the evaporator 12 and the heater core 13 in the vehicle left-right direction is designed to be substantially the same as the width dimension of the air conditioning case 11.

The heater core 13 reheats the cold air that has passed through the evaporator 12, and hot hot water (engine cooling water) flows inside the heater core 13 to heat the air using the hot water as a heat source. In the air passage in the air conditioning case 11, a front seat cold air bypass passage 15 for bypassing the heater core 13 and allowing air (cold air) to flow is formed above the heater core 13.

As is well known, the heater core 13 has a heat exchange core portion 13a composed of a flat tube through which warm water passes and a corrugated fin joined to the flat tube. Partition wall 1
A front passage 18 and a rear passage 19 are partitioned by 6 and 17. Here, the partition walls 16 and 17 are formed inside the air conditioning case 11 so as to extend over the entire length in the vehicle width direction (the direction perpendicular to the paper surface of FIG. 2) and can be integrally formed with the air conditioning case 11.

A flat air-mixing door 20 for the front seat is arranged between the heater core 13 and the evaporator 12. The front seat air mix door 20 includes warm air heated in the front seat passage 18 of the heat exchange core portion 13 a of the heater core 13 and cold air that bypasses the heater core 13 through the front seat cold air bypass passage 15. And adjust the air flow rate.

The front seat air mix door 20 is integrally connected to a rotary shaft 21 arranged in the horizontal direction (vehicle width direction), and is rotatable around the rotary shaft 21 in the vertical direction of the vehicle. There is. This front seat air mix door 2
Reference numeral 0 represents a front seat side temperature adjusting means for adjusting the temperature of the air blown to the front seat side of the passenger compartment by adjusting the air flow rate. Rotating shaft 2
1 is rotatably supported by an air conditioning case 11, one end of a rotary shaft 21 projects outside the air conditioning case 11, and is connected to an actuator mechanism using a servo motor or the like via a link mechanism (not shown). The actuator mechanism is adapted to adjust the rotational position of the air mix door 20.

On the other hand, in the air conditioning case 11, a wall surface 22 extending in the up-down direction at a predetermined interval from the heater core 13 is integrally formed with the air conditioning case 11 at a portion of the heater core 13 on the air downstream side (vehicle rear side). Has been done. The wall surface 22 forms a warm air passage 23 for the front seat that extends upward from immediately after the heater core 13. The downstream side (upper side) of this front seat warm air passage 23 joins with the downstream side of the cool air bypass passage 15 above the heater core 13 to form a front seat air mixing portion 24 that mixes cold air and warm air. is doing.

A defroster opening 25 is formed in a portion of the upper surface of the air conditioning case 11 adjacent to the front air mixing portion 24. This defroster opening 25
Is a temperature-controlled conditioned air flowing in from the air mixing section 24, and is connected to a defroster outlet through a defroster duct (not shown). From this defroster outlet, wind is blown toward the inner surface of the vehicle front window glass. Blow out.

The defroster opening 25 is opened and closed by a flat defroster door 26. This defroster door 26
Is rotated by a rotary shaft 27 arranged horizontally in the vicinity of the upper surface of the air conditioning case 11. The defroster door 26 switches between the defroster opening 25 and the communication port 28 to open and close. The communication port 28 serves as a passage for flowing the conditioned air from the air mixing section 24 toward the front seat face opening 29 and the front seat foot opening 30 described later.

A face opening 29 is provided on the upper surface of the air conditioning case 11 at a position rearward of the vehicle (closer to the occupant) than the defroster opening 25. The face opening 29 is provided through a face duct (not shown). , Is connected to a face air outlet arranged on the upper side of the instrument panel, and blows wind from the face air outlet toward the passenger's head in the passenger compartment.

Next, in the air conditioning case 11, a foot opening 30 is provided below the face opening 29. The foot openings 30 are opened on the left and right side surfaces of the air conditioning case 11, and air is supplied to the front passenger's seat side and passenger's foot side through unillustrated left and right front seat foot outlets. Blow out. A flat plate-shaped foot face switching door 31 is provided between the two openings 29 and 30 to rotate the shaft 3.
1a is rotatably arranged, and the switching door 31 allows the entrance 3 of the face opening 29 and the foot opening 30.
0a is switched and opened / closed. Here, the defroster door 26 and the foot face switching door 31 are front seat blowing mode switching means and are connected to an actuator mechanism such as a servo motor via a link mechanism (not shown).
This actuator mechanism is designed to be interlocked.

Next, in the inside of the air conditioning case 11, a rear seat cold air bypass passage 32 is formed in the lower part of the heater core 13 for allowing the cool air from the outlet of the evaporator 12 to bypass the heater core 13. In this rear seat cold air bypass passage 32, a downward inclined surface 33 for discharging condensed water of the evaporator 12 is formed, and a condensed water discharge pipe 34 is formed at the lowest portion thereof.

Further, at the air downstream side portion of the heater core 13, the rear seat switching door 3 is arranged so as to face the rear seat passage 19.
5 is rotatably arranged by a rotary shaft 36. The rear seat switching door 35 is provided in the rear seat passage 1 of the heater core 13.
The communication between 9 and the warm air passage 23 for the front seats or the hot air passage 37 for the rear seats is switched. The rear seat hot air passage 37 is a passage that guides the air downstream side of the rear seat flow passage 19 to the lower side of the heater core 13.

Since the switching door 35 is operated in conjunction with the blowing mode on the front seat side, as will be described later, the rotary shaft 36 of the switching door 35 is connected via a link mechanism (not shown).
It is connected to a front seat blowing mode switching actuator mechanism including a servo motor and the like, and is operated in conjunction with this actuator mechanism. A flat rear seat air mix door 38 is rotatably arranged by a rotary shaft 39 at a confluence of the rear seat warm air passage 37 and the rear seat cold air bypass passage 32. The rear seat air mix door 38 adjusts the air volume ratio between the warm air from the rear seat warm air passage 37 and the cool air from the rear seat cold air bypass passage 32 to control the temperature of air blown to the rear seat side of the passenger compartment. A rear seat temperature adjusting means for adjusting is configured. The warm air from the rear-seat warm air passage 37 and the cool air from the rear-seat cold air bypass passage 32 are the rear-seat air mixing unit 4
Mix at 0 to give air at the desired temperature.

The rotating shaft 39 is arranged in the horizontal direction (vehicle width direction), and one end of the rotating shaft 39 projects outside the air conditioning case 11 to form an independent actuator mechanism using a servomotor or the like via a link mechanism (not shown). The actuator mechanism is connected and the rotational position of the rear seat air mix door 38 is adjusted. On the downstream side (rear side of the vehicle) of the rear seat air mixing section 40, a flat rear seat blowout mode switching door 41 is rotatably arranged by a rotary shaft 42, and the rear seat air mixing section 40 mixes. The air of the desired temperature flows toward the rear side of the vehicle toward the rear seat face opening 43 or the rear seat foot opening 44 selected by the rear seat blowing mode switching door 41, and is not illustrated from here. The air is blown from the face outlet for the rear seat or the foot outlet for the rear seat to the head side or the foot side of the rear occupant through the connection duct.

The rotary shaft 4 of the rear seat blowing mode switching door 41
Reference numeral 2 is rotatably supported by the air conditioning case 11, and one end of the rotary shaft 42 projects outside the air conditioning case 11 and is connected to an independent actuator mechanism using a servomotor or the like via a link mechanism (not shown). Then, the operating position of the rear seat blowing mode switching door 41 is independently set by this actuator mechanism.

FIG. 3 is a block diagram showing an outline of electric control in the first embodiment, that is, an electronic control unit for air conditioning (E
CU) 50 automatically controls various air conditioners. The ECU 50 is composed of a microcomputer or the like, and controls various air conditioners installed in the blower unit 1 and the air conditioning unit 2 according to a preset program. The ECU 50
Is a vehicle-mounted battery (not shown) when the ignition switch (not shown) of the automobile engine is turned on.
Power is supplied from.

The ECU 50 includes sensor signals from a well-known sensor group 51, a front-seat operation panel 52 for air conditioning installed on the instrument panel portion in the front of the vehicle compartment, and an air-conditioning panel installed on the rear seat side of the vehicle compartment. An operation signal is input from the rear seat side operation panel 53. As is well known, the sensor group 51 includes an outside air temperature sensor 54 that detects an outside temperature (outside air temperature) of the vehicle interior, an inside air temperature sensor 55 that detects an inside temperature (inside air temperature) of the vehicle interior, and a solar radiation sensor that detects an amount of solar radiation into the vehicle interior. 56, a post-evaporator temperature sensor 57 that detects the temperature of air blown from the evaporator 12, a water temperature sensor 58 that detects the temperature of hot water to the heater core 13, and the like are provided.

The front seat side operation panel 52 is provided with a front seat side temperature setting device 59, a front seat side air volume setting device 60, a front seat side blowing mode setting device 61, an inside / outside air mode setting device 62, and the like. , The rear seat side temperature setting device 63 also on the rear seat side operation panel 53,
A rear seat side blowing mode setting device 64 and the like are provided. Then E
As drive means for various air conditioners controlled by the CU 50, a drive motor 66 for the inside / outside air switching door 6, a drive motor 8 for the blower fan 7, a drive motor 67 for the actuator mechanism of the front seat air mix door 20, a front A motor 68 for driving the actuator mechanism of the blowout mode doors 26, 31 for the seats and the switching door 35, an air mix door 38 for the rear seats
A drive motor 69 for the actuator mechanism, a drive motor 70 for the actuator mechanism of the rear seat blowing mode switching door 41, and the like are provided.

Next, the operation of the present embodiment having the above-mentioned structure will be described. In the vehicle air conditioner of the present embodiment, the operation positions of the defroster door 26 and the foot face switching door 31 which are the door means for switching the blowing mode are set. The following blowing modes can be set by selecting. (1) Face blowing mode Now, when the face blowing mode is selected based on the signal from the front seat side blowing mode setting device 61 or the blowing mode calculation result in the ECU 50, the defroster door 26
2 to the position indicated by the solid line in FIG. 2 to close the defroster opening 25 and fully open the communication port 28. Further, the foot face switching door 31 is operated to the position indicated by the solid line in FIG. 2 to close the entrance 30a of the foot opening 30.

In the face blowing mode, the switching door 35 is operated to the solid line position (normal position) in FIG. 2 to partition the flow path of the heater core 13 into the front seat flow path 18 and the rear seat flow path 19. Further, the rear seat blowing mode switching door 41 is operated to the position shown by the solid line in FIG.
3 is opened and the foot opening 44 for the rear seat is closed. At this time, when the front seat air mix door 20 is operated to the position shown by the solid line in FIG. 2, the maximum cooling state in which the front seat passage 18 of the heater core 13 is fully closed and the cold air bypass passage 15 is fully opened is set. When the blower unit 1 and the refrigeration cycle are operated in this state, the blown air from the blower unit 1 flows in through the air inlet 14 and is then cooled by the evaporator 12 to become cold wind.

In the maximum cooling state, the cold air as it is passes through the front seat cold air bypass passage 15, passes through the front seat air mixing portion 24, and the communication port 28, and then the front seat face opening portion 2 is formed.
Towards 9, cold wind blows from the front seat face air outlet toward the head of the front seat occupant. On the other hand, when the rear seat air mix door 38 is operated to the position shown by the solid line in FIG.
Since the air flow in the rear seat flow path 19 is cut off, the cool air from the outlet of the evaporator 12 passes through the rear seat cold air bypass passage 32, passes through the rear seat air mixing section 40, and passes through the rear seat. To the face opening 43, cool air blows from the rear seat face air outlet toward the head of the rear seat occupant.

When the front seat air mix door 20 is operated from the solid line position (maximum cooling position) in FIG. 2 to the intermediate opening position in order to control the temperature of the air blown into the passenger compartment, the front seat air mix door 20 is opened. According to the degree position, most of the cool air passes through the front seat cold air bypass passage 15, and the remaining part of the cool air flows into the front seat flow path 18 of the heater core 13 and is heated to become warm air, which is the front seat temperature. Raise the wind passage 23. Then, the cool air in the front seat cold air bypass passage 15 and the hot air from the front seat warm air passage 23 are mixed in the front seat air mixing section 24 and adjusted to a desired temperature.

Similarly, on the rear seat side, when the rear seat air mix door 38 is operated from the solid line position (maximum cooling position) in FIG. 2 to the intermediate opening position, the rear seat air mix door 3 is operated.
According to the opening position of 8, the air volume ratio between the cool air from the rear seat cold air bypass passage 32 and the warm air from the rear seat warm air passage 37 can be adjusted. Can be mixed and adjusted to the desired temperature. Therefore, by independently controlling the operation positions (rotational positions) of the front air mix door 20 and the rear air mix door 38,
It is possible to control the face blowout air temperature on the front seat side and the rear seat side independently.

(2) Bi-level blowing mode The defroster door 26 is operated to the solid line position in FIG. 2, and the foot face switching door 31 is operated to an intermediate position between the solid line position and the alternate long and short dash line position in FIG. Both the face opening 29 and the entrance 30a of the front seat foot opening 30 are opened. Further, the switching door 35 is operated to the solid line position (normal position) in FIG. 2 even in the bilevel blowing mode,
The flow path of the heater core 13 is the flow path 18 for the front seat and the flow path 1 for the rear seat.
It separates 9 and. The rear seat blowing mode switching door 41 is operated from the solid line position in FIG. 2 to the intermediate position to open both the rear seat face opening portion 43 and the rear seat foot opening portion 44.

Since the bi-level blowing mode is normally used in the middle season of spring and autumn, the air mix door 20 for the front seat is operated to the intermediate opening position, and the wind adjusted to the desired temperature allows the front seat face opening. Both the part 29 and the front seat foot opening 30 are simultaneously blown up and down in the passenger compartment. Also,
By operating the rear seat air mix door 38 to the intermediate opening position, the wind adjusted to the desired temperature on the rear seat side is simultaneously blown up and down in the passenger compartment from both the face opening 43 and the foot opening 44. Can blow out.

(3) Foot blowout mode The defroster door 26 is operated from the position shown by the solid line in FIG. 2 to a position where the defroster opening 25 is opened by a small amount and the communication port 28 is opened (almost fully opened). The foot face switching door 31 is operated to the position indicated by the alternate long and short dash line in FIG. 2 to close the front seat face opening portion 29 and fully open the entrance portion 30a of the front seat foot opening portion 30. The switching door 35 is operated to the solid line position (normal position) in FIG. 2 even in the foot blowing mode,
The flow path of the heater core 13 is the flow path 18 for the front seat and the flow path 1 for the rear seat.
It separates 9 and. Further, the rear seat blowing mode switching door 41 is operated to the position indicated by the alternate long and short dash line in FIG. 2 to close the rear seat face opening 43 and to open the rear seat foot opening 44.
To open.

At this time, when the front seat air mix door 20 is operated to the position indicated by the alternate long and short dash line 20a in FIG. 2, the cold air bypass passage 15 is fully closed, and the front seat flow path 18 of the heater core 13 is fully opened. Is set. In this state, the blown air from the blower unit 1 flows in from the air inlet 14, then passes through the evaporator 12, flows into the front seat flow path 18 of the heater core 13, and is heated to become warm air. This warm air rises in the warm air passage 23 to reach the front seat air mixing section 24,
From here, it goes toward the front seat foot opening 30 through the communication port 28, and hot air blows out from here toward the feet of the front seat occupant.

At this time, when the rear seat air mix door 38 is operated to the position indicated by the alternate long and short dash line in FIG. 2 to fully close the rear seat cold air bypass passage 32 and fully open the rear seat warm air passage 37, The warm air heated in the rear seat flow passage 19 of the heater core 13 passes through the warm air passage 37 and the rear seat air mixing portion 40 toward the rear seat foot opening 44. Further, warm air is blown out from the rear seat foot opening 44 through the rear seat foot outlet toward the feet of the rear seat occupant.

When the front seat air mix door 20 and the rear seat air mix door 38 are independently operated from the alternate long and short dash line position (maximum heating position) in FIG. It is possible to independently adjust the mixing ratio of the cold air and the hot air on both the rear seat side, and thereby to independently control the temperature of the foot blown air on the front seat side and the rear seat side.

In the foot blowing mode, the ratio of the blowing air amount from the defroster opening 25 to the blowing air amount from the front seat foot opening 30 is usually 2 to 8 on the front seat side.
However, if the defroster door 26 is operated to a position where the degree of opening of the defroster opening 25 increases and the degree of opening of the communication port 28 decreases compared to the case of the foot blowout mode, the defroster door 26 is removed from the defroster opening 25. The ratio of the blown air volume to the blown air volume from the front seat foot opening 30 can be set to about 5: 5.

As a result, it is possible to set the foot defroster blowing mode, which is more effective in preventing the window glass from being fogged than the foot blowing mode. (4) Defroster blowout mode When the occupant operates the front seat side blowout mode setting device 61 to select the defroster blowout mode, the ECU 50 operates the defroster door 26 to the position indicated by the alternate long and short dash line in FIG. Is fully opened to close the communication port 28. Also, E
The CU 50 operates the switching door 35 from the solid line position (normal position) of FIG. 2 to the alternate long and short dash line position in accordance with the selection of the defroster blowing mode, and the switching door 35 fully closes the rear seat warm air passage 37. Further, at the same time, the ECU 50 causes the rear seat air mix door 38 to follow the selection of the defroster blowing mode.
2 is operated to the position indicated by the alternate long and short dash line (maximum heating position) in FIG.

As a result of the above, the air mix door 20 for the front seats
2 is operated to the alternate long and short dash line position (maximum heating position) 20a, the total amount of air blown from the blower unit 1 is heated in both the front seat flow passage 18 and the rear seat flow passage 19 of the heater core 13. The entire amount of this warm air is blown from the defroster outlet toward the vehicle front window glass through the front seat warm air passage 23 and the defroster opening 25 to prevent the front window glass from being fogged.

Therefore, even in the device having the function of the independent temperature control system on the front seat side and the rear seat side, when the defroster blowing mode is selected, the defroster capacity (window glass) is utilized by utilizing the full heating capacity of the heater core 13. The ability to remove fogging) can be maximized. Further, since the rear seat air mix door 38 fully closes the rear seat cold air bypass passage 32, it is possible to prevent the cool air from being blown to the rear seat side, and to stop the unnecessary blow to the rear seat side to blow the blower. All the blown capacity of Unit 1 can be used to improve the defroster capacity.

(Second Embodiment) In the above-described first embodiment, the switching door 35 is replaced by the blowout mode doors 26, 3 on the front seat side.
2 is connected to the driving actuator (motor 68) of No. 1 via a link mechanism so that the switching door 35 is positioned at the one-dot chain line in FIG.
Although the rear seat flow path 19 is operated to a position where it communicates with the front seat hot air passage 23), the switching door 35 is used in the second embodiment.
Is driven by an actuator independent of the drive actuator (motor 68) for the front air outlet mode doors 26, 31.

FIG. 4 is a block diagram of electric control according to the second embodiment, in which a rear seat side outlet shutoff switch 65 is additionally installed on the front seat side operation panel 52. This rear seat side blowoff shut switch 65 is used when the passenger is not on the rear seat side and it is not necessary to blow air to the rear seat side, or when the rear seat passenger does not wish to blow air to the rear seat side. To operate. Further, a drive motor 71 of an actuator mechanism dedicated to the switching door 35 is independently provided as a drive unit of the air conditioner.

According to the second embodiment, the operation in each blowout mode is the same as that of the first embodiment, and in the defroster blowout mode, the switching door 35 is set to the position indicated by the one-dot chain line in FIG.
Further, the rear seat air mix door 38 is operated to the position indicated by the alternate long and short dash line in FIG. 2 (maximum heating position). In addition to this,
If air blowing to the rear seat side is not required, the occupant operates the rear seat side blowoff shut switch 65, and the ECU 50
On the basis of the input signal from the rear-side blow-off shut switch 65, the switching door 35 to the position indicated by the alternate long and short dash line in FIG. 2, and the rear seat air mix door 38 to the position indicated by the alternate long and short dash line in FIG. 2 (maximum heating position). Manipulate. Therefore, for example, in the foot blowing mode, the entire heating capacity of the heater core 13 can be used to perform foot heating on the front seat side, and the heating capacity on the front seat side can be improved.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an entire ventilation system of a vehicle air conditioner according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of an air conditioning unit section in FIG.

FIG. 3 is a block diagram of electric control according to the first embodiment.

FIG. 4 is a block diagram of electric control according to the second embodiment.

[Explanation of symbols]

11 ... Air conditioning case, 12 ... Evaporator, 13 ... Heater core,
15 ... Front seat cold air bypass passage, 18 ... Front seat flow passage, 1
9 ... Rear seat passage, 20 ... Front seat air mix door, 25
… Defroster openings, 29… Front seat face openings, 3
0 ... Foot opening for front seats, 32 ... Cold air bypass passage for rear seats, 35 ... Switching door, 38 ... Air mix door for rear seats,
43 ... Rear seat face opening, 44 ... Rear seat foot opening, 61 ... Front seat blowing mode setting device, 65 ... Rear seat side blowing shut switch, 71 ... Switching door driving motor.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Nakamura             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Wataru Naito             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Hiroshi Sugada             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F-term (reference) 3L011 CP00 CP03

Claims (5)

[Claims] 1. A cooling heat exchanger (12) for cooling air.
A heating heat exchanger (13) arranged downstream of the cooling heat exchanger (12) for heating air that has passed through the cooling heat exchanger (12), and the cooling heat exchanger The front seat cold air bypass passage (15) in which the cold air cooled in (12) flows by bypassing the heating heat exchanger (13), and the hot air passing through the heating heat exchanger (13) and the above A front seat air mix door (20) for adjusting an air flow rate with the cool air passing through the front seat cold air bypass passage (15), and warm air from the heating heat exchanger (13) and the front seat cold air. The front-seat outlet openings (25, 29, 30) through which air mixed with the cold air from the bypass passage (15) flows out, and the cold air cooled by the cooling heat exchanger (12) is the heating heat. Rear seat cold air bypass passage (3) that bypasses the exchanger (13) ), And a rear seat air mix door (38) for adjusting the air flow rate ratio between the warm air passing through the heating heat exchanger (13) and the cool air passing through the rear seat cold air bypass passage (32), Vehicle provided with rear seat blowout openings (43, 44) through which air mixed with warm air from the heating heat exchanger (13) and cold air from the rear seat cold air bypass passage (32) flows out In the air conditioner for air conditioning, an air flow path of the heating heat exchanger (13) is provided on the air outlet side of the heating heat exchanger (13) with a front seat flow path (18) and a rear seat flow path (19). ) And a switching door (35) for partitioning the switching door (35) into the front passage (1).
8) and the flow path (19) for the rear seats are operated to a partition position, while on the other hand, when it is necessary to increase the heating capacity for the front seats
A vehicle air conditioner, characterized in that the switching door (35) is operated to a position where the entire air flow path of the heating heat exchanger (13) is a front seat flow path. 2. The rear seat air mix door (38) when the switching door (35) is operated to a position where the entire air flow path of the heating heat exchanger (13) becomes a front seat flow path. )
2. The vehicle air conditioner according to claim 1, wherein the air conditioner is operated to a fully closed position of the rear seat cold air bypass passageway (32). 3. A defroster blowout opening (25) that blows air toward the inner surface of the vehicle window glass is provided as the front seat blowout opening, and the defroster blowout opening ( 25), when the defroster mode in which air is blown toward the inner surface of the vehicle window glass is selected, the switching door (3
The vehicle air conditioner according to claim 1 or 2, wherein 5) is operated to a position where the entire air flow path of the heating heat exchanger (13) is a front seat flow path. 4. The switching door (3) when air does not need to be blown out from the rear seat blowout openings (43, 44).
The vehicle air conditioner according to any one of claims 1 to 3, wherein 5) is operated to a position where the entire air flow path of the heating heat exchanger (13) is a front seat flow path. apparatus. 5. A defroster mode signal means (61) for outputting a signal indicating that the defroster mode is selected as the blowing mode on the front seat side, and a blowout opening for the rear seat (43, 44). Rear-seat shut signal means (65) that outputs a signal indicating that it is not necessary to blow air, drive means (72) that drives the switching door (35), the defroster mode signal means (61) and the rear And a control means (50) to which a signal from the seat side shut signal means (65) is input, and there is no need to blow air from the defroster mode and from the rear seat blowing openings (43, 44). Sometimes
The switching door (35) is connected to the heating heat exchanger (1) by the control means (50) through the driving means (72).
The vehicle air conditioner according to claim 3, wherein the air passage of 3) is operated to a position where the entire air passage serves as a front seat passage.